0.28 inch 0-100V Three Wire Mini DC Voltmeter Module (Red)

Monitor DC voltage levels in real-time with the 0.28 inch 0-100V Three Wire Mini DC Voltmeter. Featuring a ultra-bright 3-digit Red LED digital display, this compact panel meter measures DC voltages across a wide range from 0V to 100V DC. Thanks to its versatile 3-wire configuration, the module can measure low voltages (down to 0V) by separating its power supply line from its measurement line. Equipped with reverse polarity protection and a fine-tuning calibration potentiometer, it is ideal for battery management systems, solar panels, EV power monitoring, and DIY electronics.

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Tags 0.28 inch Voltmeter DC Voltmeter Module 3 Wire Digital Voltmeter 0-100V Voltmeter Red Mini LED Voltmeter Red LED Panel Meter Battery Voltage Indicator Arduino Voltmeter Display

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Product Details :

The 0.28 inch 0-100V Three Wire Mini DC Voltmeter is an ultra-compact, high-precision digital voltage panel meter tailored for space-critical electronic projects. Built with a high-contrast 3-digit 0.28" Red LED display, it provides clear, instantaneous voltage readouts even under bright indoor lighting or dark working conditions.

Unlike basic two-wire voltmeters (which require a minimum threshold of ~4V to power themselves and measure simultaneously), this module uses a 3-wire design. This separates the power supply input ( $V_{CC}$ ) from the voltage sensing pin ( $V_{IN}$ ), allowing you to measure voltages down to 0.0V DC with high accuracy. The unit also includes an onboard precision calibration potentiometer on the back, enabling users to calibrate the display against a benchmark multimeter.

Key Features and Benefits

Wide Voltage Measurement Range: Accurately measures direct-current (DC) potential from 0.0V up to 100V DC.
Flexible 3-Wire Configuration: Independent power supply line allows continuous measurement of low-voltage signals (from 0V) without display dimming.
Compact & Lightweight: Small footprint fits easily into custom project enclosures, dashboard cutouts, and portable instrument boxes.
Integrated Reverse Polarity Protection: Prevents damage to the onboard circuitry if input wires are accidentally wired backwards.
Onboard Calibration Trimmer: Built-in micro-potentiometer allows fine-tuning for maximum display accuracy.
Auto-Decimal Precision Shift: Automatically adjusts decimal place positioning (shifts between 0.01V and 0.1V resolution depending on the voltage level).

Technical Specifications

Feature Component	Specification Details
Display Type & Color	$0.28 ext{ inch}$ 3-Digit Digital LED (Bright Red)
Voltage Measurement Range	$ext{DC } 0.0 ext{V} - 100.0 ext{V}$
Operating Power Supply ( $V_{CC}$ )	$ext{DC } 4.0 ext{V} - 30.0 ext{V}$
Measurement Accuracy	$pm 1%$ (± $pm 1 ext{ digit}$ )
Display Refresh Rate	$pprox 200 ext{ ms}$ per reading cycle
Current Consumption	$< 20 ext{ mA}$ (Low power operation)
Input Impedance	$> 100 ext{k}Omega$
Operating Temperature	$-10^circ ext{C to } +65^circ ext{C}$
Lead Wiring	$3 imes$ Color-coded insulated wires (~15cm)

Wiring Diagrams & Connection Modes

The 3-wire voltmeter features three color-coded leads:

Red Wire ( $V_{CC}$ ): Module Power Supply Positive ( $+4 ext{V to } +30 ext{V DC}$ )
Black Wire ( $ext{GND}$ ): Common Ground Negative (Shared between power supply and target source)
Yellow / White Wire ( $V_{IN}$ ): Voltage Sensing Line ( $0 ext{V to } 100 ext{V DC}$ )

Mode 1: Measuring Voltages Below 4V (3-Wire Setup - Recommended)

Use this setup to measure low voltages (0V to 4V) or wide-ranging variable sources.

Red Wire ( $V_{CC}$ ): Connect to an independent power supply ( $+5 ext{V}$ or $+12 ext{V}$ DC source).
Black Wire ( $ext{GND}$ ): Connect to Common Ground (Negative terminal of power supply AND test source).
Yellow Wire ( $V_{IN}$ ): Connect to the positive terminal of the target voltage source to be measured ( $0 ext{V} - 100 ext{V}$ ).

Mode 2: Measuring Voltages Between 4V and 30V (2-Wire Setup)

If the target voltage is stable and strictly within $4 ext{V}$ to $30 ext{V}$ , you can tie the power supply and measurement line together.

Red Wire ( $V_{CC}$ ) + Yellow Wire ( $V_{IN}$ ): Twist together and connect to the Positive terminal of the target voltage source.
Black Wire ( $ext{GND}$ ): Connect to the Negative terminal of the target voltage source.

Caution: In 2-wire mode, do NOT exceed $30 ext{V DC}$ across the combined Red/Yellow wires, or the internal supply circuit will be damaged!

Applications

Battery Pack Voltage Monitoring: Monitor real-time charge states for $12 ext{V}/24 ext{V}/36 ext{V/48V}$ Li-ion, LiFePO4, or Lead-Acid battery systems.
Electric Vehicles & e-Bikes: Panel indicator for custom electric scooters, go-karts, and e-bikes.
DIY Bench Power Supplies: Provides real-time voltage display for custom adjustable buck/boost converter power stations.
Solar Power Systems: Displays generated voltage outputs from solar panels and charge controllers.